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In a experiment the angle are require...

In a experiment the angle are required to be measured using an instrument. 26 divisions of the main scale exactly coincide with the 30 divisions of the vernier scale . If the smallest division of the main scale is half -a-degree ` (=0.5^(@))` then the least count of the instrument is .

A

half minute

B

one degree

C

half degree

D

one minute

Text Solution

Verified by Experts

The correct Answer is:
D
30 Divisions of vernier scale coincide with 29 divisions of main sclaes
Therefore 1 V.S.D `=(29)/(30)MSD`
`"Least count"-1MSD" 1VSD"="1 MSD "(29)/(30)MSD`
`=(1)/(30)MSD=(1)/(30)xx0.5^(@)="1 minute."`
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